\'Github\' asked me to update \'webpack-dev-server\' to version 3.1.11 or higher for security reasons.
However, \'npm run dev\' will not run after the update.
It is because of version of webpack-cli. In some versions, there is no config-yargs.js file. So ^3.3.11 version of webpack-cli worked for me. Try it:
^3.3.11
npm i webpack-cli@^3.3.11